Sen. Ron Wyden (D-Ore.) asked Olsen if the government is legally allowed to use cellular data to track movement of Americans.

“There are certain circumstances where that authority may exist,” Olsen said. “It is a very complicated question.”

Olsen also said the intelligence community is working on a memo to better address the question.

On July 14, Wyden and Sen. Mark Udall (D-Colo.) wrote a letter to Director of National Intelligence James Clapper, asking if intelligence agencies can track the location of Americans through cell phones and GPS devices.

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